Biorythm

A biorhythm is based on the idea that certain aspects of your life move in cycles. These being your Physical, Emotional, Intellectual, and Intuitive well being. The cycle is based on a sine wave, each starting at 0 on the day of your birth. Each of the different aspects cycles at a different rate.

Physical cycles once every 23 days
Emotional cycles once every 28 days
Intellectual cycles once every 33 days

Where you are in your biorhythm cycles is expressed as a percentage from -100% to 100%. If your in the negatives it is not good, obviously.